Section 2: Installation
NetClock/GTP Instruction Manual
Page 2-11
2.6.4.3
RS-232 Serial Comm and RS-485 Remote Output Configuration
The NetClock/GTP has several time data formats available to suit various applications.
Data Formats 0, 1 and 3 can be configured to provide local time with or without Daylight
Savings Time corrections. Data formats 2, 4, and 90 always reflect UTC time. Refer to
section 3.3 for a complete description of available data formats. Bit rate can be
programmed from 1200 to 9600 baud. In addition, the serial ports can be configured to
output the selected dated format upon receiving a time request character or
continuously once-per-second. The Remote Output always outputs the selected data
format once-per-second.
The two RS-232 Serial Comm ports are individually programmable. The command
SER1
reads or sets the Serial Comm 1 configuration and
SER2
configures Serial
Comm 2. The command
REM1
configures the RS-485 Remote Output port. The
SER
and
REM1
command structures are shown below:
SER[X] [BAUD] [FMT] [REQ] [TD] [DST] <ent>
REM1 [BAUD] [FMT] [TD] [DST] <ent>
Where:
X
= Serial Comm Number:1,2
BAUD
= Baud Rate: 1200, 2400, 4800, 9600
FMT
= Data Format: 00, 01, 02, 03, 04, 90. Most
applications use Format 00 or 02. Refer to Section 3.3
for a complete description of the data formats.
REQ
= Request Character. Any symbol, number or letter can
be configured as the request character. The Serial
Comm port will output the selected data format upon
receiving this character.
Most applications use a capital letter "T".
The
RS-232 Comm port can also be configured to output
continuously once-per-second by typing the word
NONE
as the request character.
TD
= Time Difference from UTC, ±00:00...±12:00
Where: -00:00 = UTC
-04:00 = Atlantic
-05:00 = Eastern
-06:00 = Central
-07:00 = Mountain
-08:00 = Pacific
Refer to Figure 4-2, UTC Time Difference Map, for additional
offsets.
DST
= DST rule number, 0...6.